A barrier quietly of a road, to help keep vehicles on your way.
a powerful defensive barrier that is erected around a racetrack or in the middle of a dual-lane highway so that you can lower the likelihood of serious accidents
A figure of speech in which the expression is an evident exaggeration of the meaning intended to be conveyed or by which things are represented as much greater or less better or worse than they really are a statement exaggerated fancifully through excitement or for effect...
How would you define crash barrier?